\appendix
\ctexset {
    chapter = {
        beforeskip = 0pt,
        afterskip = 0pt,
    },
    appendix={
        number=\Roman{chapter},
    }
}

\input{units/czhx1-appendix-1}
\input{units/czhx1-appendix-2}
\input{units/czhx1-appendix-3}

